<template>
    <el-breadcrumb class="app-breadcrumb" separator="/">
        <transition-group name="breadcrumb">
            <el-breadcrumb-item v-for="(item, index) in breadcrumbs" :key="item.path">
                <span v-if="item.redirect === 'noredirect' || index === breadcrumbs.length-1" class="no-redirect">{{item.meta.title}}</span>
                <!--        >{{ $t('route.' + item.meta.title) }}</span>-->
                <a v-else @click.prevent="handleLink(item)">{{ item.meta.title }}</a>
                <!--                >{{ $t('route.' + item.meta.title) }}</a>-->
            </el-breadcrumb-item>
        </transition-group>
    </el-breadcrumb>
</template>

<script lang="ts">
    import {Component, Watch} from 'vue-property-decorator'
    import {Route, RouteRecord} from 'vue-router'
    import {mixins} from "vue-class-component";
    import Kit from "@/core/mixin/Kit";

    const pathToRegexp = require('path-to-regexp');

    @Component({
        name: 'Breadcrumb'
    })
    export default class Breadcrumb extends mixins(Kit) {
        breadcrumbs: RouteRecord[] = [];

        @Watch('$route')
        onRouteChange(route: Route) {
            // if you go to the redirect page, do not update the breadcrumbs
            if (route.path.startsWith('/redirect/')) {
                return
            }
            this.getBreadcrumb()
        }

        created() {
            this.getBreadcrumb()
        }

        getBreadcrumb() {
            let matched = this.$route.matched.filter((item) => item.meta && item.meta.title);
            const first = matched[0];
            if (!this.isDashboard(first)) {
                matched = [{path: '/dashboard', meta: {title: 'dashboard'}} as RouteRecord].concat(matched)
            }
            this.breadcrumbs = matched.filter((item) => {
                return item.meta && item.meta.title && item.meta.breadcrumb !== false
            })
        }

        isDashboard(route: RouteRecord) {
            const name = route && route.name;
            if (!name) {
                return false
            }
            return name.trim().toLocaleLowerCase() === 'Dashboard'.toLocaleLowerCase()
        }

        pathCompile(path: string) {
            // To solve this problem https://github.com/PanJiaChen/vue-element-admin/issues/561
            const {params} = this.$route;
            const toPath = pathToRegexp.compile(path);
            return toPath(params)
        }

        handleLink(item: any) {
            if (item.redirect) {
                this.$router.push(item.redirect);
                return
            }
            this.$router.push(this.pathCompile(item.path));
        }
    }
</script>

<style lang="scss" scoped>
    .el-breadcrumb__inner,
    .el-breadcrumb__inner a {
        font-weight: 400 !important;
    }

    .app-breadcrumb.el-breadcrumb {
        display: inline-block;
        font-size: 14px;
        line-height: 50px;
        margin-left: 8px;

        .no-redirect {
            color: #97a8be;
            cursor: text;
        }
    }
</style>
